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any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium)
any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium)
a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing
a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing